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Guarantees - Additional Information (Detail) (USD $)
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Feb. 28, 2014
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Residual Value Guarantee
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| Loss Contingencies [Line Items] | |
| Maximum potential obligation | $ 13,199,000 |
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Guarantee Repayment
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| Loss Contingencies [Line Items] | |
| Maximum potential obligation | 3,750,000 |
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Financial Stand-By Letters Of Credit
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| Loss Contingencies [Line Items] | |
| Borrowings outstanding | $ 14,254,000 |